Oil jet device

Abstract

Oil jet device including a main body and having a fluid communication passage held in fluid communication with an oil passageway, a nozzle pipe having an oil ejection port, a check valve opening and closing the fluid communication passage when a check ball and a valve seat which are disposed in the main body abut against each other, and a filter having a fluid communication hole and being disposed upstream of the check valve, wherein the inside diameter of the valve seat is smaller than the inside diameter of the filter, and the valve seat has an upstream end wall surface facing at least some of the fluid communication holes, and the upstream end wall surface includes a slanted surface arranged such that the cross-sectional area of an oil channel is progressively smaller in a direction from an upstream region toward a downstream region of the oil channel.

I claim: 
     
       1. An oil jet device comprising:
 a main body mounted on an internal combustion engine and having a fluid communication passage held in fluid communication with an oil passageway defined in said internal combustion engine; 
 a nozzle pipe having an oil ejection port configured to eject oil that has passed through said fluid communication passage; 
 a check valve configured to open and close said fluid communication passage when a valve body and a valve seat which are disposed in said main body abut against each other; and 
 a filter having a fluid communication hole configured to pass the oil therethrough and filter the oil, said filter being disposed upstream of said check valve and disposed in or on said main body, 
 wherein an inside diameter of said valve seat is smaller than an inside diameter of said filter, and said valve seat has an upstream end wall surface facing at least some of said fluid communication holes, and 
 said upstream end wall surface includes a slanted surface arranged such that a cross-sectional area of an oil channel is progressively smaller in a direction from an upstream region toward a downstream region of the fluid communication passage. 
 
     
     
       2. The oil jet vice according to  claim 1 ,
 wherein said filter comprises a bottomed hollow cylinder with an open end at one end of a hollow cylindrical outer circumferential wall thereof and a filter surface with said fluid communication hole at the other end thereof, and 
 said filter is housed in said main body with the outer circumferential wall held in abutment against said upstream end wall surface. 
 
     
     
       3. The oil jet device according to  claim 1 ,
 wherein said filter comprises a bottomed hollow cylinder with an open end at one end of a hollow cylindrical outer circumferential wall thereof and a filter surface with said fluid communication hole at the other end thereof, and 
 said filter is positioned such that an outer circumferential wall of a distal end of said main body is inserted in the outer circumferential wall, and said filter surface is held in abutment against an upstream end of said main body. 
 
     
     
       4. The oil jet device according to  claim 1 ,
 wherein said valve seat is integrally formed with said main body, said main body includes a valve body housing disposed downstream of said valve seat, said valve body and an elastic body configured to bias said valve body are inserted through an insertion opening of said valve body housing, and a lid member is press-fit in said insertion opening. 
 
     
     
       5. The oil jet device according to  claim 1 ,
 wherein said valve seat comprises a member separate from said main body, and 
 an elastic body configured to bias said valve body and said valve body are inserted through an upstream end opening of said fluid communication passage, and said valve seat is press-fit in said upstream end opening. 
 
     
     
       6. The oil jet device according to  claim 5 ,
 wherein an inner wall surface that defines said fluid communication passage has a step held in abutment against a downstream end of said valve seat for determining an inserted position of said valve seat. 
 
     
     
       7. The oil jet device according to  claim 1 ,
 wherein said fluid communication hole comprises a plurality of fluid communication holes defined in said filter surface of said filter in each of outer circumferential and central areas thereof, and 
 a diameter of each of said fluid communication holes is smaller than a diameter of said oil ejection port. 
 
     
     
       8. The oil jet device according to  claim 1 ,
 wherein said main body has an externally threaded surface on the outer circumference of a tubular portion thereof, 
 said internal combustion engine has an internally threaded surface into which said externally threaded surface is threaded, and 
 said main body is fastened and secured to said internal combustion engine by threaded engagement between said externally threaded surface and said internally threaded surface.